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Above Mean Sea Level
Metres
Metres
above mean sea level (MAMSL) or simply metres above sea level (MASL or m a.s.l.) is a standard metric measurement in metres of the elevation or altitude of a location in reference to a historic mean sea level. Mean sea levels are affected by climate change and other factors and change over time
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Vertical Metre
A vertical metre is the metric unit used to measure the difference in height between two points on the terrain. For example, if the base camp for a mountaineering expedition is at 2,000 metres above sea level and the upper camp is at 5,000 metres; the height difference between them is 3,000 vertical metres. The term is used when there may be confusion between the point-to-point distance and the vertical distance.Contents1 Usage 2 Abbreviation 3 See also 4 References 5 External linksUsage[edit] Vertical metres are used to measure: Altitude
Altitude
of aircraft above ground level Distance climbed during sports such as mountaineering, hiking, running or cycling[1] Cumulative distance climbed during such sports Depth of an ore deposit in mining e.g
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Non-SI Units Mentioned In The SI
This is a list of units that are not defined as part of the International System of Units
International System of Units
(SI), but are otherwise mentioned in the SI,[1][2] because either the General Conference on Weights and Measures (CGPM) accepts their use as being multiples or submultiples of SI-units, they have important contemporary application worldwide, or are otherwise commonly encountered worldwide.Contents1 Units officially accepted for use with the SI 2 Common units not officially sanctioned 3 See also 4 ReferencesUnits officially accepted for use with the SI[edit]Name Symbol Quantity Equivalent
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Special
Special
Special
or specials may refer to:Contents1 Music 2 Film and television 3 Other uses 4 See alsoMusic[edit] Special
Special
(album), a 1992 album by Vesta Williams "Special" (Garbage song), 1998 "Special
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Digital Object Identifier
In computing, a Digital Object Identifier or DOI is a persistent identifier or handle used to uniquely identify objects, standardized by the International Organization for Standardization
International Organization for Standardization
(ISO).[1] An implementation of the Handle System,[2][3] DOIs are in wide use mainly to identify academic, professional, and government information, such as journal articles, research reports and data sets, and official publications though they also have been used to identify other types of information resources, such as commercial videos. A DOI aims to be "resolvable", usually to some form of access to the information object to which the DOI refers. This is achieved by binding the DOI to metadata about the object, such as a URL, indicating where the object can be found. Thus, by being actionable and interoperable, a DOI differs from identifiers such as ISBNs and ISRCs which aim only to uniquely identify their referents
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List Of Places On Land With Elevations Below Sea Level
This is a list of places below mean sea level that are on land. Places in tunnels, mines, basements, dug holes (also with open sky), under water, under ice, or existing temporarily as a result of ebbing of sea tide etc. are not included. Places where seawater and rainwater is pumped away are included
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Foot (length)
The foot (pl. feet; abbreviation: ft; symbol: ′, the prime symbol) is a unit of length in the imperial and US customary systems of measurement. Since 1959, both units have been defined by international agreement as equivalent to 0.3048 meters exactly. In both systems, the foot comprises 12 inches and three feet compose a yard. Historically the "foot" was a part of many local systems of units, including the Greek, Roman, Chinese, French, and English systems. It varied in length from country to country, from city to city, and sometimes from trade to trade
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Surveying
A surveyor at work with a retroreflector used for distance measurement and orientation. Surveying
Surveying
or land surveying is the technique, profession, and science of determining the terrestrial or three-dimensional positions of points and the distances and angles between them. A land surveying professional is called a land surveyor. These points are usually on the surface of the Earth, and they are often used to establish maps and boundaries for ownership, locations, such as building corners or the surface location of subsurface features, or other purposes required by government or civil law, such as property sales. Surveyors work with elements of geometry, trigonometry, regression analysis, physics, engineering, metrology, programming languages, and the law
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Aerial Photography
Aerial photography
Aerial photography
is the taking of photographs from an aircraft or other flying object.[1] Platforms for aerial photography include fixed-wing aircraft, helicopters, unmanned aerial vehicles (UAVs or "drones"), balloons, blimps and dirigibles, rockets, pigeons, kites, parachutes, stand-alone telescoping and vehicle-mounted poles
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Atmospheric Pressure
Atmospheric pressure, sometimes also called barometric pressure, is the pressure within the atmosphere of Earth
Earth
(or that of another planet). In most circumstances atmospheric pressure is closely approximated by the hydrostatic pressure caused by the weight of air above the measurement point. As elevation increases, there is less overlying atmospheric mass, so that atmospheric pressure decreases with increasing elevation. Pressure
Pressure
measures force per unit area, with SI units of Pascals (1 pascal = 1 newton per square metre, 1 N/m2). On average, a column of air with a cross-sectional area of 1 square centimetre (cm2), measured from mean (average) sea level to the top of Earth's atmosphere, has a mass of about 1.03 kilogram and exerts a force or "weight" of about 10.1 newtons or 2.37 lbf, resulting in a pressure at sea level of about 10.1 N/cm2 or 101 kN/m2 (101 kilopascals, kPa)
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Altimeter
An altimeter or an altitude meter is an instrument used to measure the altitude of an object above a fixed level. The measurement of altitude is called altimetry, which is related to the term bathymetry, the measurement of depth under water.Contents1 Pressure altimeter1.1 Use in hiking, climbing and skiing 1.2 Skydiving 1.3 Use in aircraft2 Use in ground effect vehicle 3 Sonic altimeter 4 Radar
Radar
altimeter 5 Global Positioning System 6 Other modes of transport 7 See also 8 References 9 External linksPressure altimeter[edit]Digital barometric pressure sensor for altitude measurement in consumer electronic applications Altitude
Altitude
can be determined based on the measurement of atmospheric pressure. The greater the altitude, the lower the pressure. When a barometer is supplied with a nonlinear calibration so as to indicate altitude, the instrument is called a pressure altimeter or barometric altimeter
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Artificial Satellite
In the context of spaceflight, a satellite is an artificial object which has been intentionally placed into orbit. Such objects are sometimes called artificial satellites to distinguish them from natural satellites such as Earth's Moon. In 1957 the Soviet Union
Soviet Union
launched the world's first artificial satellite, Sputnik 1. Since then, about 6,600 satellites from more than 40 countries have been launched. According to a 2013 estimate, 3,600 remained in orbit.[1] Of those, about 1,000 were operational;[2] while the rest have lived out their useful lives and become space debris. Approximately 500 operational satellites are in low-Earth orbit, 50 are in medium-Earth orbit (at 20,000 km), and the rest are in geostationary orbit (at 36,000 km).[3] A few large satellites have been launched in parts and assembled in orbit
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Global Positioning System
The Global Positioning System
System
(GPS), originally Navstar GPS,[1] is a satellite-based radionavigation system owned by the United States government and operated by the United States
United States
Air Force.[2] It is a global navigation satellite system that provides geolocation and time information to a GPS receiver
GPS receiver
anywhere on or near the Earth
Earth
where there is an unobstructed line of sight to four or more GPS satellites.[3] Obstacles such as mountains and buildings block the relatively weak GPS
GPS
signals. The GPS
GPS
does not require the user to transmit any data, and it operates independently of any telephonic or internet reception, though these technologies can enhance the usefulness of the GPS
GPS
positioning information
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Helicopters
A helicopter is a type of rotorcraft in which lift and thrust are supplied by rotors. This allows the helicopter to take off and land vertically, to hover, and to fly forward, backward, and laterally. These attributes allow helicopters to be used in congested or isolated areas where fixed-wing aircraft and many forms of VTOL
VTOL
(vertical takeoff and landing) aircraft cannot perform. The English word helicopter is adapted from the French word hélicoptère, coined by Gustave Ponton d'Amécourt in 1861, which originates from the Greek helix (ἕλιξ) "helix, spiral, whirl, convolution"[1] and pteron (πτερόν) "wing".[2][3][4][5] English language nicknames for helicopter include "chopper", "copter", "helo", "heli", and "whirlybird". Helicopters were developed and built during the first half-century of flight, with the Focke-Wulf Fw 61
Focke-Wulf Fw 61
being the first operational helicopter in 1936
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Airplane
An airplane or aeroplane (informally plane) is a powered, fixed-wing aircraft that is propelled forward by thrust from a jet engine or propeller. Airplanes come in a variety of sizes, shapes, and wing configurations. The broad spectrum of uses for airplanes includes recreation, transportation of goods and people, military, and research. Commercial aviation
Commercial aviation
is a massive industry involving the flying of tens of thousands of passengers daily on airliners
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Nonbuilding Structure
A nonbuilding structure, also referred to simply as a structure, refers to any body or system of connected parts used to support a load that was not designed for continuous human occupancy
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